Andrea Spano, et al, are starting a new book:

This chapter is an introduction to the first section of the book, Linear Models, and contain some theoretical explanation and lots of examples. At the end of the chapter you will find two summary tables withLinear model formulae and functions in RandCommon R functions for inference.

The book is just getting started, but you can get it from the Quantide website. In the meantime, there are two other books on learning R and developing in R. These books are licensed Creative Commons, so they’re free to read and share.